This is considered a classic of magic. Be aware that using Woolly Nylon Thread may give you some of the issues explained in this video, even using some of the solutions provided may still be a bit risky, but you may use any other thread as long as it is 100% cotton because that may give you better results. The main reason I like using Woolly Nylon is because is thick, visual and easy to break (with some of the downsides as shown in this video). But I hope this video becomes really informative on the matter.